Re: [Xen-devel] Question of xl dump-core

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Jun 14, 2016 at 08:21:16AM +0800, wj zhou wrote:
> Hello all,

Hey,

CC-ing Daniel, and Dave.
> 
> Sorry to disturb you, but I really want to figure it out.
> The xen core of redhat 6 with pod is unable to be used with crash.
> 
> I installed a hvm of redhat 6 by xen 4.7.0-rc2.
> And the memory is set as below:
> memory=1024
> maxmem=4096
> 
> "xl dump-core" is executed, and the core is produced successfully.
> I got the following message:
> xc: info: exceeded nr_pages (261111) losing pages
> 
> Unfortunately, I got some errors when executing crash with it.
> The below is the log of crash.
> 
> <cut>
> crash 7.0.9-4.el7

http://people.redhat.com/anderson says that the latest is 7.1.5.
Can you try that version?

> ...
> 
> please wait... (gathering kmem slab cache data)
> crash: read error: kernel virtual address: ffff88010b532e00  type:
> "kmem_cache buffer"
> 
> crash: unable to initialize kmem slab cache subsystem
> 
> please wait... (gathering module symbol data)
> crash: read error: physical address: 1058a1000  type: "page table"
> <cut>
> 
> I knew balloon is not supported by redhat 6, so pod is also not supported.

?

> But I wonder the reason why the above error happens.
> Balloon and pod are also not supported by redhat 7, but it won't
> happen in redhat 7 hvm.
> I'm very appreciated if someone can help me.

Well, does it work if you maxmem != memory ?

> 
> -- 
> Regards
> Zhou
> 
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